Former prime minister Dr Mahathir Mohamad has been slammed for describing as 'too much' the request by Sarawak for a 20 percent increase in oil and gas royalties.

"He has no business talking about Sarawak's request. Someone should have told him to mind his own business," said Sarawak DAP chief Chong Chieng Jen said today.

Chong is also MP for Bandar Kuching and state assemblyperson for Kota Sentosa.